High Altitude Tuning - Page 2
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This is a discussion on High Altitude Tuning within the High Altitude Tuning forums, part of the Engine Modifications category; Ok, that is what I was thinking, but my butt dyno has been wrong before...

  1. #16
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    Ok, that is what I was thinking, but my butt dyno has been wrong before

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  3. #17
    Registered User Bionic1's Avatar
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    Quick question

    Okay, since I live in Colorado Springs, should I hav emy STi tuned? I was wondering that since the stock ECU was most likely not tuned for this kind of altitude. And if I should get it tuned, where is a good shop to go to.
    "I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the blanket of the very freedom that I provide, then questions the manner in which I provide it."
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    Yay Denver people

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  5. #19
    Registered User WOT IT's Avatar
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    Like the Idea. thumbs up to the CLUBWRX folks for the new section

  6. #20
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    Anyone up here @ 8150 with me?


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    Thumbs up

    I just got my WRX on Labor day. It looks like I found the right place to meet people with my same interest. Nice to meet you all.

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    Registered User jugger's Avatar
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    congrads on the new WRX! seems as this forum as died so a better way to meet people would be >>>> http://www.awdpirates.net
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  9. #23
    Registered User Tru3Th's Avatar
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    Im planing on doing the new turbo, front mount, fuel rails, fuel injectors, waste gate, bov, headers,upipe, re tune the chip and oil catch can...any other suggestions or things i should do or parts i should use when i decide to change the turbo??

  10. #24
    Registered User ktmrider's Avatar
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    Quote Originally Posted by Bionic1
    Okay, since I live in Colorado Springs, should I hav emy STi tuned? I was wondering that since the stock ECU was most likely not tuned for this kind of altitude. And if I should get it tuned, where is a good shop to go to.
    +1 on this. My bugeye runs like crap in open loop, can/does the dealer flash high altitude maps? I did find an oddball spark plug ( different brand and heat range from other 3 ) that seems to be helping else I am too accustomed to my old V8 Hemi. 300wtrq at 2600rpm would make anything feel sluggish....
    2005 Legacy GT - stock for now
    1991 Galant VR4 - Sold
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  11. #25
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    Toulca Mexico 8600ft!!!

    hi Guys
    I'm moving my stock 02 impreza WRX to my new home in Toluca Mexico where she will be unique! she has always been at sea level, any suggestions on tuning?
    It is quoted that all cars lose at least 25% POWER at this alt....

    thanks
    DC

  12. #26
    Registered User VVVV's Avatar
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    Tru3th - Look into high altitude turbos. They should have compressor maps with higher pressure ratios (2.5-3.0 OK), and low flow surge lines. Surge is a possibility at high altitude much more than at sea level due to the lower density air and higher boost we typically run. Remember 20 psi at 5280 is a pressure ratio of around 2.8, compared to a sea level ratio of 2.36. Some turbos really won't like that, overspeeding and ruining the bearings.

    ktmrider - Sluggishness, especially if you can tell it's worse in open loop, is probably due to a mixture that's too rich. I suggest you get some wideband readings, whether installed and on the road, or even a tail pipe sniffer on a dyno. Tailpipe will run around 1.0 to 1.5 more lean than pre-cat, but you'll get an idea how rich it's running. Are you tuned, or is this the ECU? If you're just getting used to turbo lag, then welcome to the club. De-restricting your uppipe and exhaust will help immensely.

    davidcommons - high altitude costs a lot of power. The SAE correction on the dyno usually adds around 50 hp to correct to sea level (stage 2 STi). The good news is that you can take more advantage of the turbo at low RPM. At altitude we can typically run 20 psi of boost without endangering the engine, since the absolute manifold pressure is still below what it would be on a slightly tuned stock car at sea level running 16.3 psi. The problem is in the turbo's compressor map (tho none exist for the VF series). 20 psi at altitude is a high pressure ratio (2.8). That high of pressure ratio pushes the speed of the turbo up, near the limits (if we knew what the limits were). Turbos get more of a workout, increasing the chances of them failing. Watch for oil consumption getting out of hand. It can mean failing turbo bearings. High altitude (high pressure ratio) turbos can last longer in this service, and provide better results. And get used to lag. You thought it was bad, but you had no idea.

  13. #27
    Registered User ktmrider's Avatar
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    Quote Originally Posted by VVVV View Post
    ktmrider - Sluggishness, especially if you can tell it's worse in open loop, is probably due to a mixture that's too rich. I suggest you get some wideband readings, whether installed and on the road, or even a tail pipe sniffer on a dyno. Tailpipe will run around 1.0 to 1.5 more lean than pre-cat, but you'll get an idea how rich it's running. Are you tuned, or is this the ECU? If you're just getting used to turbo lag, then welcome to the club. De-restricting your uppipe and exhaust will help immensely.
    Thx, you're right on the turbo lag. My previous vehicle was a 5.7L Hemi truck with a 2600 stall. All the years of V8 pushrod engines has me jaded ( at least off the line ). The AWD and 4EAT are not helping my butt dyno either.
    On the open loop stuff, I did the home made grounding mod and seafoamed the engine, fuel system, and crankcase. Although I made 3 changes at once ( synthetic oil change ) I believe the grounding mod was the key. The car idles smooth as glass, first tank fuel mileage went up from 20 to 23, and it runs perfectly in open loop/when cold. I was extremely skeptical about the ground stuff but since I had a few hours watching the kiddos one morning I decided to do it. $15 and 1 hour later I'm all smiles!!!!
    2005 Legacy GT - stock for now
    1991 Galant VR4 - Sold
    2002 WRX Wagon - Sold

  14. #28
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    Fort Collins Tuning

    Hey, I moved to Fort Collins recently and am looking for a good place to go for tuning my WRX. Any ideas? Thanks.

  15. #29
    Registered User bnels2348's Avatar
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    I should post this here

    I didnt see this till just now.
    maybe you all can help me out with this question....
    heres the link
    Utec
    thanks

  16. #30
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    Smile hey im a newbe and just wanted to see if.......

    you guys can tell me something about it. i just bought an 02 wrx so im getting more and more interested in doing performance mods to it. if someone can help me out it will be much appreciated

    thanks

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